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Got new tires, what psi are you all running these at?

Discussion in 'The Garage' started by lochenjons, Jan 2, 2007.

  1. lochenjons

    lochenjons 1/2 ton status

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    Just got some new (to me) 35x12.5x15r bfg muds. They have about 50% tread or so except for one that has around 30. I want these to last (obviously), what psi should I run on the street? In the dirt?
     
  2. cbbr

    cbbr 1 ton status GMOTM Winner

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    I kept mine at the recommended pressure on the street and around 18-20 PSI off road.
     
  3. 1977k5

    1977k5 3/4 ton status Vendor

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    Put 30 psi in them and then throw some powdered chalk on one from tire and one rear and let the truck roll forward. Make sure the tire tread is making full contact with the ground based off of the print it leaves on the ground. Adjust pressure accordingly.
     
  4. gmc4cw

    gmc4cw 1/2 ton status GMOTM Winner

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    street pressure should be somewhere between 28-35 psi. depends on the vehicle they are going on. use the method mentioned before. for the trail I have run 35's all the way down to 3 psi. 10 psi is a happy medium for general offroad use.
     
  5. HarryH3

    HarryH3 1 ton status Author

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    The max pressure listed on the sidewall is for when the tire is carrying its full rated wight. On a K5, I found that the tread made full contact with the road at 28 PSI up front and 26 PSI out back. YMMV. The chalk trick works great, but I drive down the street and then look for any chalk left on the tread to determine the proper pressure.
     
  6. lochenjons

    lochenjons 1/2 ton status

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    Well 20 psi off road didnt work out so good, the tire came off the rim. I figure that was because it was put on like an hour before. Fortunately I was able to get it back on even though the tire and rim were covered in mud. I got pics of it too at the bottom of http://www.cardomain.com/ride/2512119/5
     
  7. cbbr

    cbbr 1 ton status GMOTM Winner

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    I have never had a problem down as far as 16-17 PSI. I run H2 wheels and the tires have been on them for quite a while though.
     
  8. HarryH3

    HarryH3 1 ton status Author

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    The beads were probably still wet from the tire lube they use to install the tires onto the wheels. Give 'em a few days to dry out and you should not have any problems at 20 PSI off road.
     
  9. mxfireman

    mxfireman 1/2 ton status

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    I usually keep mine @ 15 psi so when I hit curbs or pot holes on the way to the mall I get maximum gription.

    Mine isn't a DD so it stays @ 15 untill I drive long distance.
     
  10. lochenjons

    lochenjons 1/2 ton status

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    Yeah that's what I figured but I couldnt wait that day
     
  11. 87BrnRsd

    87BrnRsd 1/2 ton status

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    I run my tires at 14 psi offroad. Works great for me.
    -Harrison
     
  12. Chevy305

    Chevy305 6 Lug 14bsf Status Premium Member GMOTM Winner

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    for BFG on road run them at 35psi. Thats what it says on the side of tire. I wouldn't go much under 30 if you want to try to maintain the little mileage you've got. Also you can get the tires to last longer too running them at the recomended psi.
     
  13. onetonbb74

    onetonbb74 1/2 ton status

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    20 psi seems high for some 35's on 15" rims. I bet the fresh bead is the cause for that problem. Now that you got it home, id de bead it and clean the rim real good on the inside lip and wait a couple of days before wheelin again. BTW, Buzzard and weatherstation are fun. Now that i have loud exhaust, i dont go up there anymore.
     
  14. lochenjons

    lochenjons 1/2 ton status

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    I took it over to where i got them mounted and had them clean it, I figured they do it for free (they did) so I didn't bother doing it myself. Once they took it off they looked at the tire and started laughing. Haha the weatherstation is great, do you know what it is or its real name or anything? My friend and I found it by accident from the top on our bikes and I was like this is perfect for wheelin'. I aksed around and no one knew much but everyone of them warned me aobut the guy with the shotgun on the lower roads off of it. I even met a guy that lives across from it riding his dirtbike around and he was saying he's been shot at before going down there. Normally I'd take advice like that with a grain of salt or sand or whatever it is but after seeing the old 67-72 blazer down there with tons of bullet holes, I'm a little careful going down there. I've ran my 33" all terrains at 12 psi lowest and didnt have a problem so I'm not worried about running my 35"s at 15 psi or so.
     
  15. DEMON44

    DEMON44 Low-Tech Redneck

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    My 35" BFG M/Ts are rated at 50psi. on my dodge with the cummins I run 47 in the front and 35 in the rear unloaded. anything less in the front and it gets skittish when turning and hard braking with the engine weight.
     
  16. lochenjons

    lochenjons 1/2 ton status

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    That's strange I thought they were all the same. Mine are rated at 35 psi with max load weight I think so I;ve been running a little less than that
     
  17. HarryH3

    HarryH3 1 ton status Author

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    They have them in higher load ranges for 16 inch and larger wheels. Here's a chart: http://www.bfgoodrichtires.com/specs/mud-terrain-t-a-km/1152.html
     
    Last edited: Jan 6, 2007
  18. DEMON44

    DEMON44 Low-Tech Redneck

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    mine are 35x12.5R17 M/Ts 50 PSI max load
     
  19. lochenjons

    lochenjons 1/2 ton status

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    Are larger rims sizes generally higher psi? Or what even are the advantages (or disadvantages) of larger rim sizes?
     
  20. 4xcrazy

    4xcrazy 3/4 ton status

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    i'm running the 35" equiv. 315/70/17 H2's on the Burb, last time I went wheelin with the group, I dropped them to 25psi, haven't aired them back up since, rides pretty nice, alittle soggy around some corners, but overall i am liking it.

    the tires don't even look low either, they are recommended at about 45-50psi as well.
     

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